Yesterday I implemented N+1 HA configuration on my lab with Cisco 2504 WLC. Earlier tried to find a guide especially for 2504 Controller but didn’t get on Cisco web. That’s the reason I thought to create a post about this, may be it will be helpful for others.

These WLCs are independent of each other and do not share configuration or IP addresses on any of their interfaces. Each WLC needs to be managed separately, can run a different hardware and a different software version, and can be deployed in different datacenters across the WAN link.

We must configure and manage both WLC separately.

When a primary WLC resumes operation, the APs fall back from the backup WLC to the primary WLC automatically if theAP fallback option is enabled.